Fire-control means for semi-automatic firearms



Dec. 2.7, 1949 1'. R. ROBINSON, .JR

FIRE CONTROL MEANS FOR SEMIAUTOMATIC FIREARMS 2 sheets-sheet 1 T. R.ROBINSGN, JR

FIRE CONTROL MEANS FOR SEMIAUTMATIC FIREARMS 22 Sheets-Sheet 2 T Ly/Patented Dec. 27, 1949 si PATENT orric FIRE-CONTROL MEANS FOR SEMI-AUTOMATIC FIREARMS Thomas R. Robinson, Jr., Newtown,Y Conn., as-

sgnr to The MarlinFirearms Company, New Haven, Conn., a corporation ofConnecticut Application November 15, 1947, Serial No. 786,232

9 claims. (ci. ssa-'145) The present invention relates in general tofirearms and more especially to a self-loading flrearm of the typedisclosed in my co-pending application Serial No. 766,663 led August 6,1947, now Patent No. 2,454,885, issued November 30, 1948.

An. object of the present invention is to provide superiorufre-controlmeansforl firearms of the typewherein the energy of .explosion of acartridge is used to perform the operations incidenttoureloadingwthe;nthe next shot.;A A further object of the. invention is to provide vaself-loading firearm with superior fire-control means wherein positivemeans is provided to prevent more than one shot from being fired each1,(

time the triggerJis pulled.

`A` still, further object of the invention is Y to provide aself-loading firearm with superior antidoubling means embodying aminimum number of elements, all of-which are extremely economical tomanufacture, easy to fabricate and durable Yin use. Y

With the above and other objects in view, as will appear to thoseskilled in the art from the present disclosure, this invention includesall features in the s aid disclosure which are novel over the prior artand which are not claimed in any Yseparate application.

In the accompanying drawings, in which certain modes of carrying out thepresent invention are shown for illustrative purposes:

Fig. 1 is a broken side elevation in section of a self-loading rearmembodying the improved anti-doubling `means of this invention, theAbreech-bolt ofthe firearm being shown inits :closed position andi-thefiring-plunger held in its retracted cocked position by the sear;`

Fig. 2 is'a fragmentary plan view on section line 2-2 of Fig. 1 showingthe position of the dis- .connector of the anti-doubling means at thetime the breech-bolt is in its forward breech-closing position; 'y Fig.3 is a fragmentary plan view similar to Fig. 2 but showing thedisconnector of the antidoubling means displaced by the camming actionof .the rear vend of the breech-bolt as the latter `noves out ofbattery;

Fig. 4, is a rfragmentary end elevation of the receiver of the firearmon section line 4-4 of Fig. l showing thedisconnector of theanti-doubling `means immediately above the transmitting-.mem-`.benthereof and in contact withthe. sear;.

Fig. 5.. isV a fragmentary end elevation. .ofY the greceivergoithefirearm similar to .Figli but with the.. disoonnector of theYanti-doubling means firearm in preparation `for n Ashifted-to the leftout of alignment with the transmitting-means;

Fig. 6 is a fragmentary end elevation of the receiver of the firearm onsection line 6--6 of Fig. 1

showing the relationship between the safety and the transmitting-memberof the anti-doubling means;

Fig. Vl'I is a plan view of the underside of the breech-bolt showing thecam-slot therein;

Fig. 8 is aperspective view of the disconnector ofthe anti-doublingmeans of this invention;-. and Fig. 9 isa perspective view of thetransmittingmember of the anti-doubling means of this invention. Y.

s. Referring particularly to Fig. 1, the firearm chosen for the purposesof villustrating the present invention embodies a substantially solidstock indicated generally at IIJ having a longitudinalrecess IIsubstantially rectangular in cross section formed in the top side of thestock to accommodate the barrel, receiver and trigger-plate. assembly ofthe rearm. A trigger-guard I2 is` secured to the underside of the stockopposite a vertical aperture which communicates with the stock-recess II adjacent the rear end wall thereof vfor accommodating the linger-pieceI4 of the trigger.

The receiver indicated generally at I5 comprises asubstantially-cylindrical member preferably formed from a suitablelength of tubular steel stock open at its opposite ends. The interior ofthe receiver constitutes a cylindrical chamber I6 for the action orbreech-bolt I1 of theY firearm; and a cylindrical sleeve-portion I8rearwardly of the chamber I6 in which is secured ythe end-closure orreceiver-plug I9. The barrel I 3 isV threaded or otherwise xedly securedin the forward end of the receiver. As indicated clearly in Fig. 1, inthis type of firearm the action-chamber I6 comprises a rearsection 20and a forward section. 2l, the latter being of relatively small internaldiameter and formed by securing a substantially-cylindrical bushing 22of relativelythick wallfsection in the forward open end vof thereceiver. The ,breech-bolt I1 is likewise formed of twosections ofdifferent diameters correspondend of thering-pinand which alsochamberslthe forwardend ofthe action-spring 21 and theA forvthe sear todisengage the nose 33 Wardly-projecting end of the firing-plunger 28 isadapted to be held in its retracted cocked position, as shown in Fig. l,against the force of the compressed spring by a sear 3G which ispivotally mounted on a transverse pivot-pinii in Va longitudinal grooveformed in the underside of the receiver-plug i9 and is biased by ascar-spring 32 normally to engage its nose against a shoulder 3@ of thefiring-plunger 28 to hold the latter in its cocked position. Bywithdrawing the nose 33 of the sear out of engagement with the shoulder3d of the ring-plunger, the latter will be released and thrust forwardlyby the force of the compressed spring 29 into engagement with the rearend of the firing-pin 2li.

For a more detailed description of the firingplunger and end-plugassembly, reference maybe.

made to my copending application Serial No. 788,529, filed November 28,1947. The underside of the receiver is provided withra substantiallytherear end-portion of the stock-recess Il by a ,A

substantially-shaped bracket 31th@ bottom or' which is secured to thebottom of the stock-recess by a pair of screws and is slottedlongitudinally to accommodate the linger-piece M of the trigger.

The finger-piece constitutes a substantially-solid piece, the upper endof which is welded or similarly secured between inturned fdanges 353Yformed on the bottom edges of a pair of spaced parallel Ysheet-metaltrigger-arms 3S, the forward ends of which are pivotally secured bypivot-pins lil in v'juxtaposition to the corresponding inner walls of-the bracket Si and adjacent the upper edges V,as hereinafter described.

The term anti-doubling as used herein and in the appended claims is awell-known expression in the art for denoting the functionalcharacteristics of mechanism of a self-loading rearm for positivelypreventing more than one shot from being fired with a single pull of thetrigger. In general, the anti-doubling means of the present inventioncomprises two principal elements, namely, a transmitting-memberindicated generally at ifi and a resilient disconnector indicatedgenerally at 65, the transmitting-member being adapted to transmit themotion of the trigger to the disconnector and the'latter, in turn, beingadapted by flexure to transmit a lifting motion to of the latter fromthe shoulder @Il of the firing-plunger, but only lwhen the breech-boltis in battery, that is to say, in breech-closing position. y

Referring more especially to Figs. l and 9,.the transmitting-member illmay be fabricated from solid stock, but preferably is formed from stiffsheet metal for greater economy, and comprises an elongatedsubstantially-rectangular member having a top-plate i5 and two dependingside walls il at Substantially right angles thereto, the

tY forward ends of which are provided with axiallyaligned transverseapertures 433. An inturned 'a-nge d is provided on the lower edge ofeach side wall adjacent its rear end and at substantialiy right anglesthereto to form transverse bearing-surfaces adapted to be engaged by theaforesaid transverse bridge-member i2 of the trigger. immediatelyforwardly of the inturned flanges of each side wall di is aclearance-recess formed in the lower edge of each side wall foraccommodating the transverse pivot-pin 5I of the manually-operatedsafety indicated generally at and described in detail below.

The top-plate fiof the transmitting-member is provided adjacent its rearend with a longitudinal axially-aligned substantially-rectangular slot53 for accommodating an element of the safety, as hereinafter described;and immediately forwardly of the slot 53 is a .substantiallysquare slotwhich is offset laterally from the longitudinal axis of the top-plate i5such that its longitudinal inner edge is substantially in axialalignment with the longitudinal axis of the topplate. Formed integrallyon the innei1 edge of the square slot 5d, preferably by bending up asheet metal tongue produced in stamping out the slot 5d, is anupwardly-projecting lifting-lug 55. The latter is madesubstantially-L-shaped in cross section, as shown especially well inFig. 9, so as to provide a flat beveled surface 55 which extendstransversely to the right of the inner edge of the slot dfi and makes aslight angle vertically to the horizontal plane of the top-plate i6 ofthe Vtransmitting-Inember. in' the present embodiment, theaforementioned vertical angle ofthe beveled surface 56 is of the orderof three degrees. As indicated clearly in Fig. i, the lifting-lug 55 issubstantially intermediate the opposite ends of the transmitting-member.Forwardly of the lifting-lug and between it and the front end of thetransmitting-member is an integral leaf-spring which comprises atruncated-shaped strip of metal stamped from the top-plate t@ and bentupwardly therefrom about its base, the forward end of the leaf-springbeing elevated above the horizontal plane of the top-plate and bent overslightly to provide a convex bearing-surface 58. Although thelifting-lug 55 and the leaf-spring 5l are, for economical reasons,formed from bent-up stock of the transmitting-member, it will beappreciated that these elements may be formed separately and secured tothe top-plate of the transmitting-member in any suitable manner. Theforward edge of the top-plate it is provided with a concave recess toallow clearance for the pivot-post of the disconnector in assembling thelatter in the receiver of the firearm, as described below.

The transmitting-member 4313 is adapted to be pivotally mounted in thetrigger-plate 35 by passing a pivot-pin 59 through the transverseaxially-aligned apertures i3 in the side walls i? Vor" thetransmitting-member and corresponding apertures in the side walls of thetrigger-plate. The transmitting-member is supported thus for pivotalmovement in the vertical plane of the trigger-plate, the rear end of thetransmittingmember being free and adapted to extend over thebridge-member Li2 of the trigger and to be supported thereon byengagement of its inturned flanges i9 with the blister d3 thereof.Moreover, the rear end of the transmitting-member is held downresiliently in contact with the latter by the force of the leaf-spring5l which is under slight -asea'sia compression due to engagement of itsbearingsurface 58 against the underside of the receiver. As a furtherconsequence of this construction, the leaf-spring also constitutesresilient means for holding the trigger 36 in its normal forwardposition and for returning the trigger to its normal position afterhaving been retracted for discharging the rearm. As stated above, therear end of the transmitting-member is normally supported by thebridge-element of the trigger, but if in disassembling the firearm orfor any other reason the trigger should be removed., then the rear endofthe transmitting-member would rdrop down and be supported on thetransverse pivotpin 5| of the safety by engagement of the bottom edgesof the clearance-recessesV 5i! therewith.

The safety comprises the aforesaid pivot-pin 5l which is pivotallysupported at its opposite ends in transverse axially-aligned aperturesin the depending walls of the trigger-plate 35 and provided with a at 5Uextending from substantially the middle thereof to its right-hand end,as seen clearly in Fig. 6. This end of the pivotpin is reduced indiameter to provide a trunnion Si and a substantially-square shoulder52, the latter being adapted to abut against the inner face of thecorresponding wall of the trigger-plate to prevent transverse movementof the pivot-pin to the right, as seen in Fig. 6. The opposite orleft-hand end of the pivot-pin 5 Iv extends through the correspondingwall of the trigger-plate and has a manually-operated Ahandle 63 securedthereto for rotating the pin. Mounted by a sliding fit on the attedportion of the pin 5! and abutting against a shoulder 64 formed by theflat is a safety-arm S5 having an apertured hub 66, the aperture ofwhich is formed with a transverse cord adapted tocooperate with the hatr6B of the pivot-pin 5l to lock the arm against rotation thereon. Acotter pin 61 or the like is inserted in a diametrical apertureof thepivotpin in juxtaposition to the right-hand face of the safety-arm tosecure the latter from moving transversely thereon. Mounted on theleft-hand end of the pivot-pin 5I between the corresponding wall of thetrigger-plate and the left-hand face of the-safety-arm 55, is acoil-spring 68 which, when assembled thusly on the pivot-pin, isunderslightV compression, as a consequence of which the entire safetyassembly, including the pivot-pin 5I, operating-handle 63 and safety arm65, is urged to the right, thereby taking up any slack between therespective members ofthe safety assembly and holding a knob 69 of theoperating-handle in rm frictional engagement with the adjacent wall ofthe receiver whereby the safety-arm 65 is successfully held in its onand foif positions. A A

rIhe safety-arm 65 is adapted to project up through the longitudinalslot 5,3 of the transmitting-member and to be moved into and out ofengagement with the underside of the sear Si) rearwardly of itspivot-pin for locking and unlocking the latter, the forward and rearwardmovements of the safety-arm corresponding to its on and oif positions,being limited by engagement with the front and rear ends respectively ofthe slot 53.

Referring now to Fig. 8,v thedisconnector 45 comprises a relatively-thinflat strip of metal having a pivot-post 'IU fastened to the undersidethereof intermediate its opposite ends. VThe forward end ofthedisconnector is provided with a cam-lug 1| which comprises, in thepreferred embodiment, a lip or flange 12 which is bent upwardly from arearwardly-extending bevel formed at the forward end of the disconnectorand substantially perpendicular to the top lsur,- face thereof, andappendage 13 being bent inwardly lacross the left-hand edge of thedisconnector. The front face of the upturned lip 12 forms asubstantially-flat rearwardly-extending cam-surface 14. It will beunderstood, of course, that the cam-lug may be formed separately andwelded or otherwise secured to the top of the disconnector, but theflange and appendage construction described above is by far the mosteconomical construction.

VThe rearwardly-extending reach of the disconnector is resilient andprovided with a step comprising a depending-riser 'l5 and a tread 16extending rearwardly therefrom and in a plane substantially parallel tothe top surface of the disconnector. Formed on the underside of thetread is a depending block-like member 'I1 whichis preferablyconstructed by curling under an extension of the rear end of the treadto form ahollow substantially-rectangular-shaped connectorblock. It willbe understood, however, that the latter may constitute a separate solidmember suitably fastened to the underside of the tread. In accordancewith an additional purpose ofcthis invention,v the underside of theconnector-block is provided with a substantially-fiat beveled yface 1S,the transverse axis of which makesan angle of* substantially 3 tothevertical which corresponds to the slope of the at beveledsurface 456 ofthe lifting-lug 55. -v

The disconnector is adapted to be supported within the receiver of thefirearm between the sear 3D and the transmitting-member 44 with thecam-lug 'H at the forward end of the disconnector extending beneath thebreech-bolt l1. The operation of the disconnector for selectivelyconnecting and disconnecting the transmittingmember 44 to the sear 3Bisreifected by the breechbolt inV accordance with its position in thechamber of the receiver. To this end, the bottom of the breech-bolt (seeFig. 7) is formed with a narrow substantially straight cam-groove 19which extends longitudinally thereof in the vertical plane of itslongitudinal axis, the width of the cam-groove 19 being only slightlygreater than the transverse dimension ofthe cam-lug 1|. The rear end ofthe cam-groove 19 is provided onV its left-hand side, as seen in Figs. 2and 3, with a beveled inner edge SEI which extends outwardly andrearwardly at an angle corresponding to that of thev cam-surface ld ofthe disconnector and is adapted to be cooperatively engaged thereby, 1'n

the manner and for the purpose hereinafter described. The support forthe disconnector 45 comprises the aforesaid pivot-post 'l0 whichprojects down through a bushing 8| secured inthe bottom of the receiver,the bushing being provided at its upper end with a flanged head 82 onwhich the disconnector is supported at a predetermined elevation withinthe receiver such that its cam-lug H will ride in the cam-groove 79 inthe underside of the breech-bolt and the tread 16 at the rear end of thedisconnector will engage the underside of the sear 3B forwardlyv of itspivotpin. The. disconnector is thus interposedr between the sear and thetransmitting-member with the connector-block Il of the disconnector`lying in a horizontal plane above the plane of theliftinglug of thetransmitting-member. Itwill be clear that the vertical pivot-postlllsupportsthe disconnector for oscillation in a horizontal plane withinVthe receiver and that its rotation counterclockwise such as to bring theconnector-block 11 into its right-hand position, as shown in Fig. 4 andhereinafter referred to as its normal position, is limited by engagementof the cam-face 14 of the lug 1I with the beveled edge 8D of thecamgroove 19. In its normal position, the connectorblock 11 of thedisconnector is immediately above the lifting-lug 55 of thetransmitting-member. Hence, when the latter is elevated, its lug 55 willengage the connector-block 11 and flex the resilientrearwardly-extending reach of the disconnector upwardly. At the otherextreme of its movement, hereinafter referred to as its disconnectingposition, the connector-block 11 of the disconnector is displaced to theleft of the liftinglug 55 of the transmitting-member (see Fig. 5) to aposition substantially opposite its slot 54, as a consequence of whichthe lifting-lug 55 will not make contact with the connector-block 11when the transmitting-member is elevated by retraction of the trigger.The disconnector 45 is adapted to be resiliently heldin its normalposition by the force of yieldable means comprising a wirespring 83which, as shown most clearly in Figs. 2 and 3, comprises asubstantially-Z-shaped midsection provided with a forwardly-extendingreach 84 held in juxtaposition to the right-hand inside wall of thetrigger-plate by a right-angle bent adapted to engage in an aperturethereof.

A relatively-short reach 85 extends rearwardly f, f from the Z-shapedmid-section of the spring and is engaged at its rear end in adiametrical aperture in the lower end of the pivot-post 10. Normally,the rearwardly-extending reach 85 of the 'spring acts to resilientlyhold the disconnector in its normal right-hand position, as shown inFig. 2, but whenever the disconnector is swung horizontally clockwisefrom its normal position t0. its disconnecting position, as shown inFig. 3, the spring will be distorted and, hence, on removal of the forcewhich has displaced the disconnector from its normal position to itsdisconnecting position, the force of the distorted spring will swing thedisconnector counterclockwise back to its normal position.

The operation of the anti-doubling means may be described briefiy asfollows. Assuming that the breech-bolt I1 is in battery, that is to say,is in breech-closing position, as shown in Figs. 1

and 2, then the beveled edge 88 of the cam-groove of the breech-bolt isforwardly of the cam-face 14 of the cam-lug 1I of the disconnector butsubstantially in contact therewith. Under these circumstances, thedisconnector is resiliently held by its spring 83 in its normal positionwherein its connector-block 11 is immediately above the lifting-lug 55of the transmitting-member. Assuming further that the safety is in itsoff positon, as indicated in Fig. l, then on retracting the iinger-pieceI4 of the trigger for discharging the firearm, the bridge-member 42 ofthe triggerarms 39 will be elevated, lifting the rear end of thetransmitting-member so as to move the liftinglug 55 thereof up againstthe underside of the connector-block 11 of the disconnector. Theconsequent upward force exerted against the connector-block flexes theresilient rearwardly-extending reach of the disconnector upwardly in avertical plane, whereupon the tread 16 of the disconnector elevates theforward end of the springbiased scar to withdraw its nose 33 out ofengagement with the shoulder 34 of the firingplunger 28. Thefiring-plunger is thus released and thrust forwardly forcefully by theforce of its compressed spring 29 to strike the firing-pin 24 anddischarge the cartridge in the chamber of the barrel. Following thedischarge of the cartridge and the subsequent rearward movement of thebreech-bolt I1 in the chamber of the receiver for reloading and rearmingthe fire arm, the beveled edge of the breech-bolt cam-groove movesrearwardly relative to the cam-face 14 of the camlug 1I and in so doingdisplaces rthe latter inwardly into alignment with the cam-groove 19,the disconnector being swung clockwise, as seen in Fig. 2, against theresistance set up by distorting the spring 83, whereupon the cam-lug 1Ienters the longitudinal cam-groove 19 of the breech-bolt, as shown inFig. 3. As a consequence of this movement, therear end of thedisconnector, and more especially its connector-block 11, will bedisplaced to the left of the lifting-lug 55 of the transmitting-memberthereby disconnecting the transmitting-member and the disconnector.Moreover, the latter will be held in its disconnecting positionthroughout substantially the entire rearward and forward excursion ofthe breech-bolt and until the latter has again returned to battery. Itwill be manifest, therefore, that as long as the breech-bolt is out ofbreechclosing position, a rearward pull on the fingerpiece I4 of thetrigger would be ineffective for letting off the sear. Thus, the firearmwill automatically rearm and will remain cocked until the breech-bolthasV returned to battery and the trigger again pulled to fire a secondshot. Moreover, even though the trigger were held retracted followingthe discharge of the firearm and the subsequent return of thebreech-bolt to battery, the upward displacement of the lifting-lug 55 ofthe transmitting-member would effectively prevent the connecting-block11 of the disconnector from moving back to its normalposition above thelifting-lug of the transmitting-member until such time as the latter hadbeen lowered by releasing the trigger. That is to say, there must be aconscious release of the trigger following each discharge of the firearmbefore a second shot may be fired. O'n return of the breech-bolt intobattery, the beveled edge 88 of the cam-groove 19 will again be locatedforwardly of and substantially in contact with the cam-face 14, as aconsequence of which the stressed wire-spring 83 of the disconnectorwill return the latter to its normal position for re-engagement with thetransmitting-member.

It should be pointed out that engagement of the lifting-lug 55 of thetransmitting-member with the connector-block 11 of the disconnector iseffected by mutual engagement of the respective flat beveled surfaces 56and 18 thereof, each of which is formed at an angle of substantially 3to the vertical. This construction is preferred for facilitatingdisengagement and re-engagement of these respective surfaces and moreespecially for taking up wear therebetween so as to constantly hold aclose tolerance. Mutual engagement between the cam-surface 14 and thebeveled edge 88 of the cam-groove 19 causes these surfaces to wear andsince the force of the spring 83 is acting on the disconnector to rotatethe latter in a counterclockwise direction as seen in Fig. 2, theconnector-block will move to the right relative to the lifting-lug 55,as seen in Fig. 4, whereby the beveled surface 56 of the latter willengage further up on the beveled surface 18 of the connector-blockthereby automatically compensating for wear and holding a closetolerance between the beveled surfaces of the lifting-lug and of theconnector-block.

The improved anti-doubling device of this invention provides a durable,extremely simple and relatively inexpensive mechanism which occupies aminimum of space in the firearm and which is positive in its action,these and other advantages and improvements of the device being obtainedthrough the expeditious use of materials and design whereby each elementof the device performs several functions.

The invention may be carried out in other speciic ways than those hereinset forth without departing from the spirit and essentialcharacteristics of the invention, andthe present embodiments are,therefore, to be considered in all respects as illustrative and notrestrictive, and all changes coming within the meaningand equivalencyrange of the appended claims are intended to be embraced therein.

I claim:

, 1.'In -a self-loading firearm a receiver; a breech-bolt reciprooablein said receiver; firing-means mounted-in said breech-bolt; aspring-biased sear adapted normally to coact with said firing-means tohold said iiring-means in cocked position; a trigger; and anti-doublingmeans interposedbetween said trigger and said sear and arrangednormally, that is to say, only when said breech-bolt is in battery toactuate said sear and releasel said cocked ring-means in response toretraction of said trigger, said anti-doubling means comprising atransmittingmember, an element arranged to support saidtransmitting-member for displacement vertically by retraction of saidtrigger, avdisconnector, an element arranged substantiallyperpendicularly to the supporting-element-oi said transmittingmember tosupport said disconnector between said transmitting-member and said searfor displacement horizontally to and from operative relationship withsaid transmitting-member and said sear, and an element carried by saiddisconnector and yieldable substantially vertically with respect theretofor engagement with said transmitting-member and said sear thereby toactuate said sear and release-said cocked nringmeans in response todisplacement of said transmitting-member by said trigger.

2. In a self-loading firearm a receiver; a breech-bolt reciprocable insaid receiver; firingmeans mounted in said breech-bolt; a springbiasedsear adapted normally to coact with said nring-means to hold saidtiring-means in cocked position; a trigger; and anti-doubling meansinterposed between said trigger and said Sear and arranged normally,that-is to say, only when said breech-bolt is in battery to actuate saidsear and release said cocked ring-means in response to retractionof-said trigger, said antidoubling means comprising atransmitting-member, an element arranged to support saidtransmitting-member for-displacement vertically by retraction of saidtrigger, a yieldable-element interposed between said transmitting-memberand .said receiver to hold said transmittingmember in contact with saidtrigger and normally to hold said trigger in its unretracted position, adisconnector, an element arranged to support said disconnector betweensaid transmitting-member and; said Sear Vfor displacement horizontallyto and -irom operative relationship with said transmitting-member andsaid sear, and a yieldable-element arranged normally kto hold saiddisconnector in operative relationship with said transmitting-member andsaid sear thereby to actuateysaidffsearand releasesaid cockedfiring-means in response to displacement off-said transmitting-member bysaid trigger.

3. In a self-loading firearm a receiver; a breech-bolt reciprocable insaid receiver; firingmeans mounted in said breech-bolt; a springbiasedsear adapted normally to coact with said iiring-means to hold saidiiring-means in cocked position; a trigger; anti-doubling means inter-`a connector-element carried by said disconnec-f.

tor and yieldable substantially vertically with respect thereto, andayieldable-member arrangednormally to hold the said connector-elementofP said disconnector in operative relationship with saidtransmitting-member and said sear therebyto actuate said sear andrelease said cocked iiring-means in response to displacement of said.

transmitting-member by said trigger; and a camgroove in said breech-boltarranged to coact with' the cam-lug of said disconnector when saidbreech-bolt is out of battery to move the said connector-element of saiddisconnector out of operative relationship with `said transmitting--member against the resistance of said yieldableelement so as to preventthe release of said cocked iiring-means in response to displacement oisaid transmitting-member by said trigger.

4. In a self-loading rearm a receiver; a breech-bolt reciprocable insaid receiver; firing.- means mounted in said breech-bolt; aspringbiased sear adapted normally to coact with said firing-means tohold said firing-means in cocked position; 4a trigger; and anti-doublingmeans interposed between said trigger and said Sear and arrangednormally, that is to say, only when said breech-bolt is in battery toactuate said sea'r and release said cocked firing-means in response toretraction of said trigger, said anti-doublingl means comprising atransmitting-member arranged to be displaced upwardly substantiallyvertically by retraction of said trigger and a dis connector arranged tobe supported between said transmitting-member and said sear for pivotalmovement in a horizontal plane said disconnector vhaving a resilient.arm located normally immediately above said transmitting-member wherebyas the latter is Adisplaced upwardly by said trigger saidtransmitting-member engages and ilexes said resilient arm upwardly intoconm tact with said sear to actuate said sear and release said cockedfiring-means. c y 5. In a self-loading rearm a receiver; a breech-boltreciprocably mounted in said receiver; ring-means mounted in saidbreecll-` bolt; a spring-biased sear Vadapted normally to coactvwithsaid firing-means to hold said firingmeans in cocked position; atrigger; and antidoubling means interposed between `said trigger andsaid sear and yarranged normally, that is to say, only when saidbreech-bolt is in battery to. actuate `said-Sear Vand release saidcocked firingraeanain response t0. retragton .0f Saidtrgeerla saidanti-doubling means comprising a transmitting-member pivotally supportedat its forward end in said receiver for ysubstantially-verticalmovement, the rear end of said transmittingmember being supported onsaid trigger and elevated thereby when said trigger is retracted, and adisconnector supported intermediate its opposite ends in said receiveron an aXis substantially perpendicular to the pivotal supportingmeans ofsaid transmitting-member for substantially-horizontal movement betweensaid transmitting-member and said sear said disconnector having aresilient arm provided with a connector-element Varranged normally tooverlie said transmitting-member whereby as the latter is displacedupwardly by said trigger said transmitting-member engages and flexes thearm oi?r said disconnector upwardly thereby to move saidconnector-element into contact with said sear to actuate said sear andrelease said cocked firing-means.

` 6. 1n a self-loading rearm a receiver; a breech-bolt reciprocablymounted in said `re ceiver; firing-means mounted in said breechbolt; aspring-biased sear adapted normally to coact with said firing-means tohold said firingmeans in cocked position; a trigger; anti-doubling meansinterposed between said trigger and said sear for actuating said sear soas to release said cocked firing-means in response to retraction of saidtrigger comprising a transmittingmember pivotally supported at itsforward end in said receiver for substantially-vertical movement,resilient means carried by said transmittingmember arranged to coactwith said receiver to hold the rear end of said transmitting-member inengagement with said trigger thereby to hold said trigger normally inits unretracted position, and a resilient disconnector supportedintermediate its opposite ends in said receiver forsubstantially-horizontal movement between said transmitting-member andsaid sear said resilient disconnector being arranged normally to overliesaid transmitting-member whereby as the latter is displaced upwardly bysaid trigger said transmitting-member engages and nexes said resilientdisconnector upwardly into contact with said sear to actuate said scarand release said cocked ring-means; and means carried by said breechboltarranged to coact with said flexible disconnector when said breech-boltis out of battery to displace said disconnector out of alignmentvertically with said transmitting-member so as to prevent ie actuationof said sear and release of said cocked firing-means in response to theYelevation of said transmitting-member by said trigger.

7. In a self-loading firearm a receiver; a breech-bolt reciprocablymounted in said receiver; firing-means mounted in said breechbolt; aspring-biased sear adapted normally to coact with said firing-means tohold said iiringmeans in cocked position; a trigger having a transversebridge-element; anti-doubling means interposed between said trigger andsaid sear for actuating said sear so as to release said cockedfiring-means in response to retraction of'said trigger comprising atransmitting-member having an upwardly-projecting lug intermediate itsopposite ends, a transverse pivot engaged in the forward end of saidtransmitting-member and arranged to pivotally support the latter forsubstantially-vertical movement in said receiver, and resilient meanscarried by said pivoted transmitting-member arranged to hold the rearend thereof down in contact with said trigger bridgeelement thereby tohold said trigger normally in its non-retracted position, a resilientdisconnector interposed between said transmitting-member and said sear,said disconnector having a vertical pivot-post intermediate its oppositeends arranged to pivotally support said disconnector forsubstantially-horizontal movement in said receiver, a depending-block atthe rear end of said disconnector, a cam-lug at the forward end of saiddisconnector, and a spring connected to said vertical pivot-post to biassaid disconnector in a horizontal position such that saiddepending-block is normally immediately above the upwardly-projectinglug of said transmitting-member, said trigger bridge-element Ybeingarranged to engage the rear end of saidv transmittingmember and elevateits upwardly-projecting lug into engagement with said depending-block onretraction of said trigger to flex said resilient disconnector upwardlythereby to actuate said sear and release said cocked ring-means; and acam-groove in the underside of said breechbolt arranged to coact withthe cam-lug of said disconnector when said breech-bolt is out of batteryto displace the depending-block of Said disconnector out of alignmentvertically with the upwardly-projecting lug of said transmittingmemberso as to prevent the actuation of said sear and release of said cockedfiring-means in response to the elevation of the rear end of saidtransmitting-member on retraction of said trigger.

8. In a self-loading rearm a receiver; a breech-bolt reciprocablymounted in said receiver; firing-means mounted in said breechbolt; aspring-biased sear adapted normally to coact with said ring-means tohold said ringmeans in cocked position; a trigger having a transversebridge-element; anti-doubling means interposed between said trigger andsaid sear for actuating said sear so as to release said cockedring-means in response to retraction of said trigger comprising atransmitting-member having an upwardly-projecting 1ug intermediate itsopposite ends and provided with a verticallybeveled top surface, atransverse pivot engaged in the forward end of said transmitting-memberand arranged to pivotally support the latter for substantially-verticalmovement in said receiver, and resilient-means carried by said pivotedtransmitting-member arranged to hold the rear end thereof down incontactwith said trigger bridge-element thereby to hold said triggernormally in its non-retracted position, a resilient disconnectorinterposed between said transmitting-member and said sear saiddisconnector having a vertical pivot-post intermediate its opposite endsarranged to pivotally support said disconnector forsubstantially-horizontal movement in said receiver, a depending-block atthe rear end of said disconnector having a verticallybeveled bottomsurface, a cam-lug at the forward end of said disconnector, and a springconnected to said vertical pivot-post to bias said disconnector in ahorizontal position such that said depending-lug is normally immediatelyabove the upwardly-projecting lug of said transmitting-member, saidtrigger bridge-element being arranged to engage the rear end of saidtransmitting-member and elevate the verticallybeveled top surface of itsupwardly-projecting lug into engagement with the vertically-beveledbottom surface of said depending-block to flex said resilientdisconnector upwardly thereby to actuate said sear and release saidcocked firingmeans; and a cam-groove in the underside of saidbreech-bolt arranged to coact with the camlug of said disconnector whensaid breech-bolt is out of battery to displace the depending-lug of saiddisconnector out of alignment vertically with the upwardly-projectinglug of said transmitting-member so as to prevent the actuation of saidsear and release of said cocked firingw means in response to theelevation of the rear end of said transmitting-member on retraction ofsaid trigger.

9. In a self-loading rearm a receiver; a breech-bolt reciprocablymounted in said receiver; ring-means mounted in said breechbolt; aspring-biased sear adapted normally to coact with said firing-means tohold said firingmeans in cocked position; a trigger; a safety comprisingan arm constructed and arranged to be manually moved into engagementwith said sear to prevent disengagement thereof from said cockedfiring-means; and anti-doubling means interposed between said triggerand said sear for actuating` said sear so as to release said cockedfiring-means in response to retraction of said trigger comprising atransmitting-member having a slot to accommodate the arm of said safety,the opposite ends of said slot constituting abutments to limit theforward and rearward movements of said safety, said transmitting-memberbeing pivotally supported at its forward end in said receiver forsubstantially-vertical movement therein, and a resilient elementarranged to hold the rear end of said transmitting-member in engagementwith said trigger so as to be elevated thereby when said trigger isretracted, and a resilient disconnector pvotally supported intermediateits opposite ends in said receiver between said transmitting-member andsaid sear for substantially-horizontal movement therebetween, saidresilient disconnector being arranged normally to overlie saidtransmitting-member and to be engaged and deflected upwardly therebywhen said trigger is retracted thereby to engage and actuate said searand release said cocked ring-means.

THOMAS R. ROBINSON, JR.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,403,133 Stokke Jan. 10, 19222,037,065 Burton Apr. 14, 1936 2,242,496 Williams May 20, 1941 2,267,078Burton Dec. 23, 1941

